gecko/dom/system/cocoa/nsAccelerometerSystem.mm

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Doug Turner <dougt@dougt.org>
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsAccelerometerSystem.h"
#include "nsIServiceManager.h"
#include "stdlib.h"
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <sys/vm.h>
#define MODEL_NAME_LENGTH 64
static char gModelName[MODEL_NAME_LENGTH];
nsAccelerometerSystem::nsAccelerometerSystem()
{
}
nsAccelerometerSystem::~nsAccelerometerSystem()
{
}
// Data format returned from IOConnectMethodStructureIStructureO.
// I am not sure what the other bits in this structure are,
// or if there are any, but this has to be 40 bytes long or
// the call to read fails.
//
// Since we make the SmsData struct larger than any members we plan to access we
// keep track of the the size of the part of the struct we plan to access for
// use in bounds checking.
#define SMSDATA_PADDING_SIZE 34
typedef struct
{
PRInt16 x;
PRInt16 y;
PRInt16 z;
PRInt8 unknown[SMSDATA_PADDING_SIZE];
} SmsData;
#define SMSDATA_USED_SIZE (sizeof(SmsData) - SMSDATA_PADDING_SIZE)
void
nsAccelerometerSystem::UpdateHandler(nsITimer *aTimer, void *aClosure)
{
nsAccelerometerSystem *self = reinterpret_cast<nsAccelerometerSystem *>(aClosure);
if (!self) {
NS_ERROR("no self");
return;
}
size_t bufferLen = sizeof(SmsData);
void * input = malloc(bufferLen);
void * output = malloc(bufferLen);
if (!input || !output)
return;
memset(input, 0, bufferLen);
memset(output, 0, bufferLen);
size_t structureOutputSize = bufferLen;
#if (MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4)
kern_return_t result = ::IOConnectMethodStructureIStructureO(self->mSmsConnection,
5, /* Magic number for SMCMotionSensor */
bufferLen,
(IOByteCount*)&structureOutputSize,
input,
output);
#else
kern_return_t result = ::IOConnectCallStructMethod((mach_port_t)self->mSmsConnection,
5, /* Magic number for SMCMotionSensor */
input,
bufferLen,
output,
&structureOutputSize);
#endif
if ((result != kIOReturnSuccess) || (structureOutputSize < SMSDATA_USED_SIZE)) {
free(input);
free(output);
return;
}
SmsData *data = (SmsData*) output;
float xf, yf, zf;
// we want to normalize the return result from the chip to
// something between -1 and 1 where 0 is the balance point.
const int normalizeFactor = 250.5;
if (!strcmp(gModelName, "MacBookPro5,1")) {
xf = ((float)data->x) / normalizeFactor;
yf = (((float)data->y) / normalizeFactor) * -1;
zf = ((float)data->z) / normalizeFactor;
}
else if (!strcmp(gModelName, "MacBookPro5,3")) {
xf = ((float)data->y) / normalizeFactor;
yf = (((float)data->x) / normalizeFactor) * -1;
zf = (((float)data->z) / normalizeFactor) * -1;
}
else
{
xf = (((float)data->x) / normalizeFactor) * -1;
yf = ((float)data->y) / normalizeFactor;
zf = ((float)data->z) / normalizeFactor;
}
free(input);
free(output);
self->AccelerationChanged( xf, yf, zf );
}
void nsAccelerometerSystem::Startup()
{
// we can fail, and that just means the caller will not see any changes.
mach_port_t port;
kern_return_t result = ::IOMasterPort(MACH_PORT_NULL, &port);
if (result != kIOReturnSuccess)
return;
CFMutableDictionaryRef dict = ::IOServiceMatching("SMCMotionSensor");
if (!dict)
return;
io_iterator_t iter;
result = ::IOServiceGetMatchingServices(port, dict, &iter);
if (result != kIOReturnSuccess)
return;
io_object_t device = ::IOIteratorNext(iter);
::IOObjectRelease(iter);
if (!device)
return;
result = ::IOServiceOpen(device, mach_task_self(), 0, &mSmsConnection);
::IOObjectRelease(device);
if (result != kIOReturnSuccess)
return;
mach_port_deallocate(mach_task_self(), port);
/* get the version of the hardware we are running on. */
int mib[2];
size_t len = MODEL_NAME_LENGTH;
mib[0] = CTL_HW;
mib[1] = HW_MODEL;
sysctl(mib, 2, gModelName, &len, NULL, 0);
mUpdateTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mUpdateTimer)
mUpdateTimer->InitWithFuncCallback(UpdateHandler,
this,
mUpdateInterval,
nsITimer::TYPE_REPEATING_SLACK);
}
void nsAccelerometerSystem::Shutdown()
{
if (mSmsConnection)
::IOServiceClose(mSmsConnection);
if (mUpdateTimer) {
mUpdateTimer->Cancel();
mUpdateTimer = nsnull;
}
}